Drop Rishard Matthews for Kenny Stills or Jermaine Kearse?

I have a first round bye, so my concern here is for weeks 15 and 16 in the event of an injury to my starters

Matthews appears to be the number 1 when healthy and has performed well. Stills has a great schedule, has performed, but appears to be the number 3 and seems to be boom or bust. Kearse exploded the last 2 weeks, but his schedule seems to be the most difficult